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Finding the Fourth Proportional to 643,864.86, 888,531.99 and 357,388.38

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Solution

The fourth proportional to 643,864.86, 888,531.99 and 357,388.38 is: 493,195.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,864.86 : 888,531.99 = 357,388.38 : x
  2. Step 2: Convert to fraction form
    643,864.86/888,531.99 = 357,388.38/x
  3. Step 3: Cross multiply
    643,864.86x = 888,531.99 × 357,388.38
  4. Step 4: Simplify right side
    643,864.86x = 317,551,008,484.28
  5. Step 5: Solve for x
    x = 317,551,008,484.28/643,864.86
  6. Step 6: Final answer
    x = 493,195.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.